AbAppletic AbAppletic - 4 months ago 55
Android Question

Firebase Android: An internal error has occurred. [ OPERATION_NOT_ALLOWED ]

Signing in via Google in my application gives this error:

An internal error has occurred. [ OPERATION_NOT_ALLOWED ]

I have enabled Google in the Firebase console. Permissions are correct, and I can't seem to find the problem. I'm sure this has nothing to do with my code, but if it does tell me.


public void onClick(View v) {
switch (v.getId()) {
case R.id.sign_in_button:

private void signIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);

public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
// An unresolvable error has occurred and Google APIs (including Sign-In) will not
// be available.
Log.d(TAG, "onConnectionFailed:" + connectionResult);
Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show();

public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
if (result.isSuccess()) {
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = result.getSignInAccount();
} else {
// Google Sign In failed
Log.e(TAG, "Google Sign In failed.");

private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
Log.d(TAG, "firebaseAuthWithGooogle:" + acct.getId());
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
mFirebaseAuth.signInWithCredential(credential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {

public void onComplete(@NonNull Task<AuthResult> task) {
Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());

// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.w(TAG, "signInWithCredential", task.getException());
Toast.makeText(SignInActivity.this, "Authentication failed: " + task.getException(),
} else {
startActivity(new Intent(SignInActivity.this, MainActivity.class));


I had the same problem. I got the solution in the forum post [Google Auth] com.google.firebase.FirebaseException: An internal error has occurred.

This happened to me when I did not have the authentication method enabled in the console Firebase. When I enabled Google authentication, I got the same exception, just without [OPERATION_NOT_ALLOWED].